Modelling and evaluation of a thermal microfluidic sensor fabricated on plastic substrate

Patsis, G. P.; Πετρόπουλος, Αναστάσιος; Kaltsas, G.

doi:10.1007/s00542-011-1409-5

Cited by 3 publications

(1 citation statement)

References 15 publications

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“…They found that the velocity detection limit is about 5 mm/s, which is in the range of the critical velocity for the transition to the mixed convective flow. Microchannels realized by microfluidic structures were used for measuring very low flow rates as reported by some authors, such as, Buchner et al [8] and Patsis et al [9]. In these two reports water flow was used for the evaluation of the thermal flow sensors.…”

Section: Introductionmentioning

confidence: 99%

Minimum Detectable Air Velocity by Thermal Flow Sensors

Issa

Lang

2013

Sensors

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Miniaturized thermal flow sensors have opened the doors for a large variety of new applications due to their small size, high sensitivity and low power consumption. Theoretically, very small detection limits of air velocity of some micrometers per second are achievable. However, the superimposed free convection is the main obstacle which prevents reaching these expected limits. Furthermore, experimental investigations are an additional challenge since it is difficult to generate very low flows. In this paper, we introduce a physical method, capable of generating very low flow values in the mixed convection region. Additionally, we present the sensor characteristic curves at the zero flow case and in the mixed convection region. Results show that the estimated minimum detectable air velocity by the presented method is 0.8 mm/s. The equivalent air velocity to the noise level of the sensor at the zero flow case is about 0.13 mm/s.

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Section: Introductionmentioning

confidence: 99%